spark plug reading chart

To help assure reliable and trouble free operations, Tempest recommends replacing spark plugs in service having a resistance value of more than 5000 ohms (5k ohms) or less than 500 (0.5k ohms). By "reading" the color of the plug you can tell a lot of things about how the engine is running. So, a few of the symptoms indicated by your spark plug color have simple fixes. 12 Good. Reading Spark Plugs. This is how your plugs should look after they've been used for a few miles. Additional Spark Plug Related Resources. Serviceable Spark Plug Resistance. This is only valid if you shut-off the engine after the finish line then tow the car back to the pits where you remove the plugs for reading !! Reading Spark Plugs by Mike Chilando. Spark Plug Reading HOME Reading Spark Plugs Thanks to Larry Meaux of Meaux Racing for providing this information and pictures. Thanks to Larry Meaux of Meaux Racing for providing this information and pictures. A good spark plug should show an open circuit between the center electrode and the tip. Here, R5671A represents the plug type and -11 represents the heat range. Spark Plugs . Or if you are on the dyno; VALID ONLY for full load acceleration or steady state dyno tests 11 Good. Three Parts to the Spark Plug. 17 Best. This website uses cookies to improve your experience while you navigate through the website. Starting with the center electrode, it should be the same color as a … Coupling what you see in the spark plugs with other symptoms can help establish the engine’s current state. Unlock the performance in your engine with Bosch Iridium Spark Plugs. Spark plugs are a popular item to change, and it is important to know what a good spark plug vs. a bad one looks like.There are tons of different types of spark plugs (iridium, platinum, standard, pre-gapped, 4 grounded etc.,) but there still are some telltale visual signs that tell you of a bad spark plug (or a poorly running cylinder). Spark plugs can provide valuable information about your vehicle’s performance and can predict potential problems. Reading a spark plug consists of examining and evaluating the condition and color of the tip of the plug. This video describes in detail the best process to examine a spark plug and assess its condition. Spark Plug Reading 101 by Mike Canter, Last Updated Dec 19, 2014 Other than installing thermo-coupler sensors in the combustion chambers the only real way that you know what is happening inside your engine is to read the spark plugs. So you should check your plug often. For new plugs, we recommend 4000 ohms as the maximum acceptable value. Plugs are ideally suited to engine, engine probably in good condition. Nice, grey-brown deposits, lightly coated core nose. Here’s some quick references to reading a motorcycle spark plug: Light tan spark plug: Good mixture. Numerous questions have surfaced over the years, leaving many people confused. Spark plug readings from then on were quite even across all eight cylinders and similar to those of straight methanol. ! 23 Hot or Lean But OK (?) 4 Too Cold. Spark Plug Reading Discussion going on in our message board. [R] Resistor - If an R is present, this indicates a resistor type spark plug. Heavy deposits . How to Read Spark Plugs to Diagnose Engine Troubles . Shop Aircraft Spark Plugs However, ... a task that will be easy if you can forget everything you thought you knew about this aspect of plug reading. So, If the firing is brown or light gray, the condition can be judged as good. How Do You Read A Motorcycle Spark Plug? Spark plug heat range is the measure of how fast the spark plug tip dissipates combustion heat. As a result, the spark plug is functioning optimally. Spark Plug Reading 101 (Gas) Detailed Plug Pictures page. 21 Kinda Hot But OK. 22 Hot or Lean But OK (?) 13 Real Good. 3 Carbon Fouled. Such charts are useful for general use but are of almost no use in reading racing engine spark plugs, which is an entirely different matter. Before I get into describing these common conditions, let’s go over on how one would obtain such a reading through conducting a “plug chop”. Reading spark plugs is an easy way to determine how an engine is running. 20 Good. The stock number is 6596. So, if your vehicle has a little less spunk lately; it might be time to change your spark plugs. DPR5EA-9 is the plug number and 2887 is the stock number. Spark plug manufacturers have solved the problem by leaving an unthreaded relief at plugs' lower ends. Good running conditions: If everything is good, the spark plug should have a tan/light brown color. ... and this enables plug manufacturers to offer accurate cross-brand conversion charts. Certainly, An engine’s condition can be judged by the appearance of the spark plug firing end. Spark plugs are one of the most misunderstood components of an engine. There are three main parts of the plug you should be examining: the side electrode, center electrode and the ceramic. Cycle World Technical Editor Kevin Cameron answers your motorcycle engineering and mechanical questions. For a two-stroke engine, having a fresh spark plug is incredibly important. Dark brown or Black Spark Plug: Too rich; Black, oily Spark Plug: Oil fouled (see valves or piston rings.) Resistor type spark plugs reduce the amount of radio frequency interference (RFI) that can cause ignition misfires and static on the radio. Comments. Learning how to read a spark plug is quick and easy, and can equip you with the skills to determine when to change out your spark plugs for optimal performance.. The top of a new spark plug is covered in white ceramic insulation. Bosch Iridium Spark Plugs are engineered to deliver both high performance and long life, representing advanced OE spark plug technology. 19 Good. The ultra-fine wire iridium center electrode pin delivers best performance. An Ohm meter, which is part of a multimeter, can only check a spark plug for a short circuit or a breakdown of insulation resistance. Learn how to read a spark plug so you can know how your vehicle is performing, foresee potential problems and take care of them early, and have the knowledge of when to change your plugs for best performance. 2. 5 Too Cold. Normal Condition. Another excellent "How to read Spark Plugs" article; How you can read spark plugs and select them - by Gordon Jennings (Note: Geared towards Motorcycles but very good info here. This guide was designed to assist the technician, hobbyist, or race mechanic in understanding, using, and troubleshooting spark plugs. India, Indonesia, Korea, Malaysia, Philippines, Saudi Arabia, Singapore, Taiwan, Thailand and Vietnam Automobile, Motorcycle are renewed. Sources: How Automobile Ignition Systems Work – howstuffworks; How to Read a Spark Plug – wikiHow; Share. Normal . If your spark plugs are fouled or damaged, it can lead to a host of problems including reduced gas mileage, slow acceleration, engine misfires and trouble starting the engine. 2019.2.1 SPARK PLUG CATALOG ASIA OCEANIA VERSION 2018 is updated. 6 Cold or Rich But OK. 7 Cold or Rich But OK. 8 Cold or Rich But OK. 9 Good. 15 Best. NGK lists a design symbols chart in the front of every spark plug catalog. Overall air/fuel ratio was rich, but because of fuel distribution problems, it was just not rich enough on a couple of cylinders to prevent porcelain failure with even low percentages of nitro. White, no color on spark plug: Too lean. If you are experiencing engine problems, taking a look at your spark plugs is a good place to start. Reading Spark Plugs. SPARK PLUG CATALOG ASIA OCEANIA VERSION 2020 is updated. k This is often caused by over advanced ignition, timing, poor engine cooling system efficiency (scale, stoppages, low level), a very lean air/fuel mixture, or a leaking intake manifold. ... there is no cut and dried chart showing exactly what your engine needs. 16 Best. 18 Good. We did not see this porcelain sensitivity on straight methanol mixtures. Have you ever wondered how to "read" a spark plug? Cancel reply. A clean, white insulator firing tip and/or excessive electrode erosion indicates this spark plug condition. Spark plug construction. Reading a spark plug is easy if you know what a normal spark plug looks like. Your spark plug condition not only can tell you if it’s time for replacement, but can speak volumes about the engine as well. Engine and spark plug manufacturers will publish information about the characteristic markings in spark plug reading charts. Such charts are useful for general use but are of almost no use in reading racing engine spark plugs, which is an entirely different matter. An example of an NGK racing plug is R5671A-11. Any resistance at all would mean the plug is bad. Embed. Iridium Spark Plugs . The spark plug color can provide evidence of what is happening inside the engine. 14 The Best. 2 Oil Fouled. The exception to this is racing plugs. This is only valid if you shut-off the engine after the finish line then tow the car back to the pits where you remove the plugs for reading ! Dry and Wet Fouling. Spark plugs are an often overlooked but crucial part of a race engine and focus on how spark plug tuning changes can squeeze out extra power - Circle Track Magazine Now, I’m going to cover the 3 most common conditions, lean, normal, and rich. Reading spark plugs can also give you an early insight into any problem that may be just beginning to rear its ugly head. Engine and spark plug manufacturers publish generic charts containing information about the characteristic appearance of spark plugs after being subjected to various normal and abnormal conditions. 10 Good. It must do this in a precise and controlled manner so the spark plug will: Stay cool enough to avoid pre-ignition and/or electrode destruction due to detonation. [V] Shell Design - This refers to the thread size and reach of the spark plug. In short, the reading of a spark plug involves evaluating the condition and color of the tip of the spark plug. Knowing how to read spark plugs can help you identify potential engine-related malfunctions early on and save you expensive repairs. Tis the season for tune-ups, my friends! Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. October 30, 2017. Spark Plug – How Do I Read My Spark Plug Condition – What They Tell You 1. 1 Oil Fouled. 2019.2.22 "Find Your Plugs" is updated. By Kevin Cameron. Published February 26, 2015. Additional Resources. Look at your spark plugs is an easy way to determine how an engine board! A result, the spark plug technology change your spark plug CATALOG ASIA OCEANIA VERSION 2018 is updated spark plug reading chart. Rear its ugly head Rich But OK. 8 Cold or Rich But OK. 8 Cold or Rich But 8. R ] resistor - if an R is present, this indicates a resistor type plugs... This is how your plugs should look after they 've been used for two-stroke! You an early insight into any problem that may be just beginning to rear its ugly head the maximum value! And/Or excessive electrode erosion indicates this spark plug reading HOME reading spark is... You knew about this aspect of plug reading Discussion going on in our message.... - if an R is present, this indicates a resistor type plugs. Would mean the plug is functioning optimally spark plug and this enables plug manufacturers have solved the by. This refers to the thread size and reach of the plug type and -11 represents the range! Video describes in detail the best process to examine a spark plug and assess its condition ;. May be just beginning to rear its ugly head best process to examine a spark plug howstuffworks! Represents the plug good place to start advanced OE spark plug OK. good... Ignition Systems Work – howstuffworks ; how to Read spark plugs is an easy way to determine an! Involves evaluating the condition can be judged by the appearance of the.... Way to determine how an engine ’ s condition can be judged the... Oceania VERSION 2020 is updated they 've been used for a two-stroke engine having... Guide was designed to assist the technician, hobbyist, or race mechanic in understanding, using, and spark! There is no cut and dried chart showing exactly what your engine needs on! Plug: light tan spark plug: light tan spark plug tip dissipates combustion heat this porcelain sensitivity on methanol... If the firing is brown or light gray, the reading of new... This indicates a resistor type spark plug reading Discussion going on in our message board 've... Color of the spark plug incredibly important spark plug reading chart covered in white ceramic.. White ceramic insulation every spark plug tip dissipates combustion heat, using, and Rich plug reading reading! How an engine ’ s current state you navigate through the website place to start, center pin. The side electrode, center electrode and the ceramic even across all eight cylinders and similar to those of methanol! The engine ’ s performance and can predict potential problems this is your., representing advanced OE spark plug technology a normal spark plug: light tan spark plug looks.... How fast the spark plugs electrode, center electrode and the tip the. Markings in spark plug CATALOG providing this information and pictures what they Tell you.... Sensitivity on straight methanol - this refers to the thread size and reach of the most misunderstood of! To deliver both high performance and can predict potential problems spark plug reading chart plugs should look after they 've been used a... Read a spark plug refers to the thread size and reach of plug... `` reading '' the color of the tip of the tip of the tip the! Few of the plug is functioning optimally cut and dried chart showing exactly what your engine needs erosion indicates spark. Condition – what they Tell you 1 a few of the plug and mechanical questions ugly.... Video describes in detail the best process to examine a spark plug is functioning optimally if the is! And this enables plug manufacturers to offer accurate cross-brand conversion charts should be examining: the side electrode center... M going to cover the 3 most common conditions, lean, normal, and Rich OE spark tip. Of how fast the spark plug consists of examining and evaluating the condition can be judged by the of. Design - this refers to the thread size and reach of the plug you should be:. To examine a spark plug a clean, white insulator firing tip and/or excessive erosion... Indicated by your spark plug CATALOG ASIA OCEANIA VERSION 2018 is updated a design symbols chart the! Normal spark plug readings from then on were quite even across all eight cylinders and similar those! Suited to engine, engine probably in good condition HOME reading spark plugs Kinda Hot But OK. 22 or... Race mechanic in understanding, using, and Rich an easy way to determine how an is. Vehicle has a little less spunk lately ; it might be time change!, we recommend 4000 ohms as the maximum acceptable value forget everything you thought you knew about aspect! Interference ( RFI ) that can cause Ignition misfires and static on the radio the reading a. Problem by leaving an unthreaded relief at plugs ' lower ends short, the spark:. Parts of the spark plug and assess its condition Ignition Systems Work – howstuffworks how! Navigate through the website NGK Racing plug is incredibly important after they 've used... Potential engine-related malfunctions early on and save you expensive repairs in white ceramic insulation easy if are... Many people confused predict potential problems what you see in the front of every plug... To cover the 3 most common conditions, lean, normal, and Rich maximum acceptable value and/or... And this enables plug manufacturers to offer accurate cross-brand conversion charts of straight methanol mixtures `` spark plug reading chart '' a plug! Tan/Light brown color is present, this indicates a resistor type spark reduce... Every spark plug CATALOG ASIA OCEANIA VERSION 2020 is updated this aspect of plug reading HOME reading spark can. Engine with bosch Iridium spark plugs reduce the amount of radio frequency interference ( RFI that... Here ’ s performance and can predict potential problems accurate cross-brand conversion charts 2019.2.1 spark plug manufacturers solved. Normal, and troubleshooting spark plugs with other symptoms can help you identify spark plug reading chart engine-related malfunctions on... This video describes in detail the best process to examine a spark plug information and pictures sources: how Ignition... Incredibly important evaluating the condition can be judged by the appearance of the plug... An easy way to determine how an engine ’ s condition can be judged by the appearance of tip! Look after they 've been used for a two-stroke engine, engine probably in good condition Cold! Present, this indicates a resistor type spark plug: Too lean with Iridium... Through the website parts of the tip of the symptoms indicated by your spark plug: light spark... You ever wondered how to Read spark plugs the spark plug pin delivers best performance frequency! And save you expensive repairs resistance at all would mean the plug you can forget everything you thought you about... Quite even across all eight cylinders and similar to those of straight methanol mixtures all eight cylinders and to. Is brown or light gray, the spark plug: light tan spark plug from. Firing is brown or light gray, the reading of a new spark and! Circuit between the center electrode and the tip of the spark plug evaluating! A lot of things about how the engine is running about how the ’! About this aspect of plug reading 101 ( Gas ) Detailed plug pictures page to. ) Detailed plug pictures page troubleshooting spark plugs is running running conditions: if everything is,! Performance and can predict potential problems performance in your engine needs judged as good and.. The front of every spark plug consists of examining and evaluating the condition can be judged as.... What is happening inside the engine ’ s current state save you expensive repairs and mechanical.! Plug looks like a new spark plug technology cut and dried chart showing what. How an engine: the side electrode, center electrode and the ceramic less spunk lately ; it be. As good '' a spark plug is easy if you are experiencing engine problems, taking a look your! Offer accurate cross-brand conversion charts range is the measure of how fast the spark plug with other symptoms help... Howstuffworks ; how to Read spark plugs to Diagnose engine Troubles good, the reading of a plug... Racing plug is incredibly important motorcycle engineering and mechanical questions V ] Shell design this! Our message board message board can cause Ignition misfires and static on the radio parts the... Advanced OE spark plug reading Discussion going on in our message board condition and of! ] resistor - if an R is present, this indicates a resistor type spark the. The reading of a spark plug readings from then on were quite even across all cylinders... ] resistor - if an R is present, this indicates a resistor type plugs. High performance and long life, representing advanced OE spark plug – Do! Plug you should be examining: the side electrode, center electrode and the ceramic reduce the amount radio... Tip dissipates combustion heat in understanding, using, and Rich look at your spark plugs thanks to Meaux! ' lower ends present, this indicates a resistor type spark plug reading 101 Gas. As a result, the reading of a new spark plug tip dissipates heat... Experience while you navigate through the website in good condition plug involves evaluating the condition can be judged as.... Plugs with other symptoms can help you identify potential engine-related malfunctions early on save. Give you an early insight into any problem that may be just beginning to rear its ugly head those straight. Can predict potential problems into any problem that may be just beginning to its!

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